
from rest_framework import serializers

from goods.models import SKU


class CartSerializer(serializers.Serializer):

    sku_id = serializers.IntegerField(label='sku_id',required=True,min_value=1)
    count = serializers.IntegerField(label='数量',required=True,min_value=1)
    selected = serializers.BooleanField(label='是否勾选',required=False,default=True)

    def validate(self, attrs):

        #判断商品是否存在
        sku_id = attrs['sku_id']
        try:
            sku = SKU.objects.get(pk=sku_id)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')

        #判断库存是否充足
        count = attrs['count']
        if sku.stock < count:
            raise serializers.ValidationError('库存不足')

        return attrs


class CartSKUSerializer(serializers.ModelSerializer):

    count = serializers.IntegerField(label='数量')
    selected = serializers.BooleanField(label='是否勾选')

    class Meta:
        model = SKU
        fields = ['id','name','count','selected','price','comments','default_image_url']


class CartSKUIDSerializer(serializers.Serializer):
    sku_id = serializers.IntegerField(required=True,min_value=0)


















































